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. 2016 Feb 24;14:43. doi: 10.1186/s12957-016-0810-z

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© Morizawa et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Kaplan-Meier curves of overall survival (OS) after surgical resection. a OS in all cases. All the events were due to tumor progression. b OS according to the type of surgery. The extended surgery improved OS in RPS. c OS according to the Ki-67 labeling index. P values were calculated using the log-rank test